Materia
HN Social history and conditions. Social problems. Social reform
H Social Sciences (General)
144
HM Sociology
82
HQ The family. Marriage. Woman
66
HV Social pathology. Social and public welfare
61
L Education (General)
27
K Law (General)
26
HC Economic History and Conditions
24
HT Communities. Classes. Races
23
BF Psychology
21
JA Political science (General)
21
RA0421 Public health. Hygiene. Preventive Medicine
21
LB2300 Higher Education
20
F1201 Latin America (General)
16
HB Economic Theory
16
NA Architecture
14
R Medicine (General)
13
RA Public aspects of medicine
13
HD Industries. Land use. Labor
10
HF Commerce
10
LC Special aspects of education
10
G Geography (General)
7
LB1603 Secondary Education. High schools
7
HG Finance
6
TD Environmental technology. Sanitary engineering
6
GF Human ecology. Anthropogeography
5
HE Transportation and Communications
5
HJ Public Finance
5
J General legislative and executive papers
5
QP Physiology
5
RT Nursing
5
GE Environmental Sciences
4
GT Manners and customs
4
LB1501 Primary Education
4
ZA Information resources
4
D History (General)
3
E11 America (General)
3
GB Physical geography
3
JV Colonies and colonization. Emigration and immigration. International migration
3
JZ International relations
3
LB Theory and practice of education
3
LB2361 Curriculum
3
S Agriculture (General)
3
T Technology (General)
3
B Philosophy (General)
2
GN Anthropology
2
HA Statistics
2
HD28 Management. Industrial Management
2
HX Socialism. Communism. Anarchism
2
JC Political theory
2
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